Abstract
Metal-free heterogeneous photocatalysts provide an environmental-friendly and cost-efficient avenue for green organic synthesis. Covalent organic frameworks (COFs) as heterogeneous photocatalysts showcase promising potential in the field of photocatalytic organic reactions due to their high porosity, insolubility and tailor-made functions. However, thus far, COF-based catalysts only mediated a few types of reactions. Herein, we developed a series of isoreticular nitrogen-rich covalent organic frameworks (N-COFs) with comparable porous structures as photocatalysts which effectively mediated the borylation of aryl iodides with broad substrate scope. Remarkably, 6N-COF exhibits excellent photocatalytic efficiency and superior recyclability. It suggests a new pathway to construct efficient heterogeneous photocatalysts for the borylation of aryl halides.
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